Waste heat power generation system, photovoltaic and photothermal mixed power plant, and waste heat power generation method

Abstract

This application provides a waste heat power generation system, a photovoltaic and photothermal mixed power plant, and a waste heat power generation method, relating to the field of waste heat power generation technology. The waste heat power generation system includes a first heat exchanger for acquiring solar waste heat and performing primary heat exchange with a first working material, a second heat exchanger connected to the first heat exchanger for acquiring photothermal waste heat and performing secondary heat exchange with the first working material, a first turbine connected to the second heat exchanger, a first generator connected to the first turbine for generating electricity, a condenser connected to the first turbine for cooling the first working material, and a first pump connected to the condenser and the first heat exchanger for transporting the first working material to the first heat exchanger for heat exchange circulation. The waste heat power generation system of the embodiment of this application can generate electricity by simultaneously utilizing solar waste heat and photothermal waste heat, improving energy utilization efficiency and avoiding resource waste.

Description

Technical Field

[0001] This application relates to the field of waste heat power generation technology, and particularly to a waste heat power generation system, a solar and solar thermal hybrid power plant, and a waste heat power generation method.

Background Art

[0002] A solar and solar thermal hybrid power plant is a station that uses solar energy to generate electricity, which combines two technologies: solar power generation and solar thermal power generation.

[0003] In related technologies, both the solar power generation process and the solar thermal power generation process of a solar and solar thermal hybrid power plant generate a large amount of medium and low temperature waste heat. Among them, some medium and low temperature waste heat is directly discharged, and some medium and low temperature waste heat is cooled.

[0004] However, in related technologies, the cooling or direct discharge of waste heat leads to energy waste.

Summary of the Invention

Problems to be Solved by the Invention

[0005] This application provides a waste heat power generation system, a solar and solar thermal hybrid power plant, and a waste heat power generation method.

Means for Solving the Problems

[0006] In a first aspect, an embodiment of this application provides a waste heat power generation system, a first heat exchanger for obtaining solar waste heat generated by a solar power generation system and performing primary heat exchange with a first working substance; a second heat exchanger connected to the first heat exchanger, for obtaining solar thermal waste heat generated by a solar thermal power generation system and performing secondary heat exchange with the first working substance; a first turbine connected to the second heat exchanger, for using the first working substance after secondary heat exchange to do work and generate first mechanical work; a first generator connected to the first turbine, for obtaining the first mechanical work and generating electricity; A condenser connected to the first turbine for cooling the first working material used in the first turbine, It includes a condenser and a first heat exchanger, and a first pump connected to the first heat exchanger for transporting the cooled first working material to the first heat exchanger and entering the heat exchange circulation.

[0007] In a second aspect, an embodiment of the present application provides a solar and photothermal combined power plant. Solar power generation system and photothermal power generation system, A waste heat power generation system which is any waste heat power generation system provided in the first embodiment, The first heat exchanger of the waste heat power generation system is used to acquire waste solar heat generated by the photovoltaic power generation system and perform primary heat exchange with the first working material. The second heat exchanger of the waste heat power generation system is used to acquire the waste heat generated by the photothermal power generation system and perform secondary heat exchange with the first working material.

[0008] In a third aspect, the embodiments of the present application provide a waste heat power generation method which can be applied to any waste heat power generation system provided in the first aspect. The process involves acquiring waste solar heat generated by a photovoltaic power generation system and performing primary heat exchange with the first working material, The process involves acquiring the waste heat generated by the photothermal power generation system and performing secondary heat exchange with the first working material, A step of generating first mechanical work by performing work using the first working material after secondary heat exchange, The first step is to acquire machine work and generate electricity, A step of cooling the first working material used, The process includes the step of transporting the cooled first working material to the first heat exchanger to enter the heat exchange circulation. [Effects of the Invention]

[0009] The waste heat power generation system, photovoltaic and photothermal mixed power plant, and waste heat power generation method provided in the embodiments of the present invention are as follows: The waste heat power generation system can acquire solar waste heat generated by the photovoltaic power generation system by installing a first heat exchanger, and by installing a second heat exchanger, the second heat exchanger is connected to the first heat exchanger, and the first working material that has undergone primary heat exchange by the first heat exchanger enters the second heat exchanger, where it continues to acquire photothermal waste heat generated by the photothermal power generation system and performs secondary heat exchange with the first working material, thereby enabling the simultaneous acquisition of solar waste heat and photothermal waste heat in the same power generation system, and thereby improving the energy utilization rate of the waste heat power generation system. [Brief explanation of the drawing]

[0010] The drawings herein are incorporated into the specification and constitute part of the specification, illustrating embodiments conforming to the present application and are used together with the specification to interpret the principles of the embodiments of the present application. [Figure 1] This is a diagram illustrating the system principle of a photovoltaic and photothermal combined power plant provided in the embodiment of the present invention. [Figure 2] Figure 1 is a diagram illustrating the system principle of the waste heat power generation system. [Figure 3] This is a flowchart of the waste heat power generation method provided in the embodiment of the present invention. [Figure 4] Figure 2 is a system principle diagram of the heat storage bypass unit. [Figure 5] Figure 2 is a system principle diagram of the temperature control bypass unit.

[0011] The above drawings illustrate clear embodiments of the present invention, which will be described in more detail later. These drawings and textual descriptions are not intended to limit the scope of the ideas of the present invention in any way, but are intended to explain the concepts of the present invention to those skilled in the art by referring to specific embodiments. [Modes for carrying out the invention]

[0012] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will refer to the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application.

[0013] In related technologies, in both the solar power generation process and the solar thermal power generation process of a solar and solar thermal hybrid power plant, a large amount of medium and low temperature waste heat is generated. This medium and low temperature waste heat usually cannot be directly recovered and utilized. Among them, some medium and low temperature waste heat is directly discharged, and some medium and low temperature waste heat is cooled.

[0014] However, in related technologies, cooling or directly discharging waste heat will lead to energy waste.

[0015] Regarding the above technical problems, referring to FIGS. 1 and 2, the embodiment of this application provides a waste heat power generation system, including a first heat exchanger 110 for obtaining the solar waste heat generated by the solar power generation system 200 and performing a primary heat exchange with a first working substance; a second heat exchanger 120 connected to the first heat exchanger 110 for obtaining the solar thermal waste heat generated by the solar thermal power generation system 300 and performing a secondary heat exchange with the first working substance; a first turbine 130 connected to the second heat exchanger 120 for using the first working substance after the secondary heat exchange to do work and generate a first mechanical work; a first generator 140 connected to the first turbine 130 for obtaining the first mechanical work and generating electricity; a condenser 150 connected to the first turbine 130 for cooling the first working substance used in the first turbine 130; and a first pump 160 connected to the condenser 150 and the first heat exchanger 110 for transporting the cooled first working substance to the first heat exchanger 110 to enter the heat exchange cycle.

[0016] The waste heat power generation system 100 provided in the embodiment of this application installs a first heat exchanger 110 to obtain the solar waste heat generated by the solar power generation system 200, recover and utilize the solar waste heat, and avoid energy waste. Moreover, the first heat exchanger 110 can obtain the solar waste heat to lower the temperature of the solar power generation system 200 and improve the photoelectric conversion efficiency of the solar power generation system 200.

[0017] The waste heat power generation system 100 installs a second heat exchanger 120, obtains the waste heat of solar thermal power generation generated by the solar thermal power generation system 300, recovers and utilizes the waste heat of solar thermal power, and avoids energy waste. Moreover, after the circulating medium of the solar thermal power generation system 300 is reused, its temperature drops, and when the solar thermal system operates, there is less cooling medium for the circulating medium.

[0018] In addition, the waste heat power generation system 100 installs a first turbine 130, a first generator 140, a condenser 150 and a first pump 160, and the first heat exchanger 110, the second heat exchanger 120, the first turbine 130, the first generator 140, the condenser 150 and the first pump 160 jointly form an organic Rankine cycle power generation system. The first turbine 130 can use the first working substance to do work and generate first mechanical work. The first generator 140 can obtain the first mechanical work and generate electricity. It can generate electricity by using solar heat waste and waste heat of solar thermal power. Moreover, the first working substance can circulate in the organic Rankine cycle power generation system, continuously obtain solar heat waste and waste heat of solar thermal power, improve the energy utilization rate, and avoid waste of resources.

[0019] In addition, since the solar heat waste generally has a lower temperature than the waste heat of solar thermal power, the second heat exchanger 120 is connected to the first heat exchanger 110. The first working substance that has undergone primary heat exchange by the first heat exchanger 110 enters the second heat exchanger 120, continues to perform secondary heat exchange with the first working substance after obtaining the waste heat of solar thermal power generated by the solar thermal power generation system 300, and can simultaneously obtain solar heat waste and waste heat of solar thermal power in the same power generation system, thereby improving the energy utilization rate of the waste heat power generation system 100.

[0020] In some embodiments, referring to Figure 2, the waste heat power generation system 100 further includes a solar waste heat recovery unit 170, the solar waste heat recovery unit 170 includes a solar waste heat acquisition module and a second pump 173, the solar waste heat acquisition module includes a first pipe 171, the first pipe 171 is used to connect to the photovoltaic power generation system 200 and has a second working material in the first pipe 171, the second working material is used to acquire solar waste heat generated by the photovoltaic power generation system 200, the second pump 173 is connected to the first pipe 171 and is used to transport the second working material after acquiring solar waste heat to the first heat exchanger 110 and perform primary heat exchange with the first working material, the solar waste heat acquisition module further includes a second pipe 172, the second pipe 172 is used to connect the photovoltaic power generation system 200 and the first heat exchanger 110, and the second working material after heat exchange is transmitted to the photovoltaic power generation system 200 to enter the heat exchange circulation.

[0021] In this embodiment, one end of the first pipe 171 is connected to the first heat exchanger 110, and the other end of the first pipe 171 is used to connect to the photovoltaic power generation system 200. The first pipe 171 contains a second working material, and when the second working material is located at the location of the photovoltaic power generation system 200, the second working material is heated by the solar waste heat of the photovoltaic power generation system 200, thereby enabling the acquisition of solar waste heat.

[0022] The second pump 173 is connected to the first piping 171, and the second pump 173 can transport the second working material, after acquiring solar waste heat, to the first heat exchanger 110, where it performs primary heat exchange with the first working material, thereby realizing the utilization of solar waste heat.

[0023] One end of the second pipe 172 is connected to the first heat exchanger 110, and the other end of the second pipe 172 is used to connect to the photovoltaic power generation system 200. After heat exchange with the first working material, the second working material flows through the second pipe 172 to the photovoltaic power generation system 200, where it can again acquire the solar waste heat generated by the photovoltaic power generation system 200.

[0024] As a result, the second working material circulates between the photovoltaic power generation system 200 and the first heat exchanger 110 via the first pipe 171 and the second pipe 172. During the heat exchange circulation process, the second working material can continuously acquire solar waste heat from the photovoltaic power generation system 200 and continuously transfer the acquired solar waste heat to the first heat exchanger 110 for use in generating electricity.

[0025] To ensure clarity, the second working substance can be liquid water.

[0026] In some specific embodiments, the solar waste heat acquisition module 171 is a solar energy frequency divider module or a fixed solar energy frequency divider module.

[0027] Solar energy frequency division technology is a new technology for utilizing solar energy that enables the frequency division and utilization of photoelectric and photothermal energy. This technology selectively absorbs light in frequency bands where thermal effects are significant using a medium such as nanofluid, while generating electrical energy from light in other frequency bands using a solar module. As a result, solar energy frequency division technology enables the frequency division and utilization of solar energy, improves the photoelectric conversion efficiency of the solar power generation system 200, and also allows for the recovery of the generated medium- and low-temperature thermal energy.

[0028] In a solar energy frequency division module, the orientation of the solar module can change according to the direction of solar irradiation. Its main components are a spacer layer below the solar module and working material piping below the spacer layer. A frequency division fluid is injected into the spacer layer to absorb heat from the solar module layer, and then transferred to the second working material. This type of frequency division method can generate electricity by utilizing solar energy to the maximum extent possible, improving resource utilization efficiency.

[0029] In a fixed solar energy frequency division module, the orientation of the solar module cannot be changed, and its main component is a prism. By placing the prism around the solar module, the prism can divide the sunlight, and by rationally arranging the spatial position and angle of the prism, the solar energy is combined to heat the second working material.

[0030] In some other embodiments, referring to Figure 2, the waste heat power generation system 100 further includes a first preheater 180, which is installed between a first turbine 130 and a first condenser 150, and is also installed between a first pump 160 and a first heat exchanger 110, and is used to preheat a first working material that enters the first heat exchanger 110.

[0031] In some cases, installing a first preheater 180 increases the temperature at which the first working material enters the first heat exchanger 110, increasing the degree of superheating after evaporation, increasing the enthalpy difference in the first turbine 130, and decreasing the mass flow velocity of the first working material, thus reducing the photoelectric conversion efficiency. Alternatively, increasing the temperature at which the first working material enters the first heat exchanger 110 reduces the temperature difference in heat transfer, thus reducing exergy loss and increasing exergy efficiency.

[0032] During the day, there is sufficient solar energy, and that heat cannot be used to generate, absorb, and utilize large amounts of electrical energy. However, at night, there is no solar energy, and therefore, electrical energy cannot be generated.

[0033] Furthermore, the photoelectric conversion efficiency is closely related to the temperature at which the first working material enters the first turbine 130, and follows an almost normal distribution. That is, as the temperature at which the first working material enters the first turbine 130 increases, the photoelectric conversion efficiency increases, and when the temperature of the first working material rises to a first predetermined temperature, the photoelectric conversion efficiency of the organic Rankine circulation decreases. Therefore, in order to maintain a high photoelectric conversion efficiency, the temperature at which the first working material enters the first turbine 130 should be below the first predetermined temperature. Note that the first predetermined temperature is related to the type of first working material, and the first predetermined temperature can be set based on the specific type of first working material.

[0034] With respect to the above technical problems, in some embodiments, referring to Figure 4, the waste heat power generation system further includes a thermal storage bypass unit 500, the thermal storage bypass unit 500 comprising: a first main path 510 used to connect a second heat exchanger 120 and a first turbine 130 so that a first working material flows from the second heat exchanger 120 to the first turbine 130; a first temperature sensor 520 installed in the first main path 510 and used to detect a first temperature of the first working material at the outlet of the second heat exchanger 120; a first control valve 530 installed in the first main path 510 and located between the first temperature sensor 520 and the first turbine 130; and a first branch path 540, one end of which is connected to the first control valve 530 and the other end of which is connected to the first main path 510 between the first control valve 530 and the first turbine 130, and is arranged so that the first working material flows from the first control valve 530 to the first main path 510. The system includes a heat accumulator 550 installed in the first branch 540 and used to acquire the heat quantity of the first work material; a second temperature sensor 560 installed between the other end of the first branch 540 and the first turbine 130 and used to detect the second temperature of the first work material; and a controller (not shown) which is communicated to the first temperature sensor 520, the first control valve 530, the heat accumulator 550, and the second temperature sensor 560, respectively, and is used to control the first control valve 530 to turn on when the first temperature is higher than a first predetermined temperature, causing the heat accumulator 550 to acquire the heat quantity of a portion of the first work material, mixing the first work material from which the heat quantity has been acquired with the first work material from which the heat quantity has not been acquired, thereby lowering the temperature of the first work material, and further controlling the opening of the first control valve 530 to increase when the second temperature is higher than a first predetermined temperature, thereby lowering the second temperature to the first predetermined temperature or lower.

[0035] In this embodiment, the heat storage unit 550 can store excess solar heat and thermal heat acquired by the first working material during the day, and release it at night to heat the first working material. After heating, the first working material enters the first turbine 130 to generate electricity, thereby achieving a peak-shaving effect.

[0036] This embodiment employs a localized cooling method to lower the overall temperature, thereby improving the controllability of the cooling process.

[0037] Specifically, by installing the heat storage unit 550, the heat energy of a portion of the first working material is acquired, the temperature of a portion of the first working material is lowered, the cooled first working material is mixed with the first working material that has not been cooled, and the overall temperature of the first working material decreases. By installing the second temperature sensor 560, the second temperature sensor 560 is connected to the controller for communication, and the second temperature sensor 560 can be used to monitor the second temperature of the first working material after mixing and to immediately and effectively feed the second temperature back to the controller, thereby allowing the controller to immediately adjust the opening degree of the first control valve 530, increasing the opening degree of the first control valve 530, bringing the second temperature below the first predetermined temperature, and ensuring that the heat storage bypass unit 500 operates normally.

[0038] In this embodiment, the amount of heat in the heat storage device at night may not be sufficient to raise the second temperature within a suitable range, resulting in low photoelectric conversion efficiency. Furthermore, the minimum temperature at which the organic Rankine cycle power generation system can generate electricity is related to the type of organic material, and if the second temperature of the first working material at night is lower than the corresponding minimum temperature, the organic Rankine cycle power generation system cannot operate normally.

[0039] Therefore, in some other embodiments, referring to Figure 5, the waste heat power generation system further includes a temperature control bypass unit 600, the temperature control bypass unit 600 comprising: a third temperature sensor 610 installed in the first branch 540 and used to detect the third temperature of the first working material at the outlet of the heat accumulator 550; a second control valve 620 installed in the first branch 540 and located between the third temperature sensor 610 and the first turbine 130; a second branch 630, one end of which is connected to the second control valve 620 and the other end of which is connected to the first branch 540 between the second control valve 620 and the first turbine 130, and which is arranged so that the first working material flows from the second control valve 620 to the first branch 540; a heat pump 640 installed in the second branch 630 and used to increase the heat of the first working material; and a first branch between the other end of the second branch 630 and the first turbine 130 The controller includes a fourth temperature sensor 650 installed in the branch 540 and used to detect the fourth temperature of the first work material. The controller is communicated to the third temperature sensor 610, the second control valve 620, the heat pump 640, and the fourth temperature sensor 650, respectively. When the third temperature is lower than the second predetermined temperature, the controller controls the first control valve 530 to turn on, guiding all of the first work material to the first branch 540. The controller also controls the second control valve 620 to turn on, causing the heat pump 640 to increase the heat content of at least some of the first work material, mixing the first work material with the heat content of the first work material with the heat content of the first work material that has not been increased, thereby increasing the temperature of the first work material. Furthermore, when the fourth temperature is lower than the second predetermined temperature, the controller controls the opening of the second control valve 620 to increase the degree of opening, which is used to raise the fourth temperature to the second predetermined temperature or higher.

[0040] In this embodiment, if the third temperature of the first working material is lower than the second predetermined temperature, the third temperature of the first working material can be adjusted to the second predetermined temperature or higher, and the organic Rankine circulating power generation system can operate normally.

[0041] This embodiment employs a localized heating method to increase the overall temperature and improve the controllability of the heating process.

[0042] Specifically, the second control valve 620 can achieve the diversion of the first working material, facilitating localized heating of the first working material, the heat pump 640 increases the heat content of a portion of the first working material, the first working material with increased heat content mixes with the first working material that does not have increased heat content, and the overall temperature of the first working material rises. By installing the fourth temperature sensor 650, the fourth temperature sensor 650 is connected to the controller and can monitor the fourth temperature of the first working material after mixing. The fourth temperature can be used to immediately and effectively feed back the fourth temperature to the controller, thereby allowing the controller to immediately adjust the opening of the second control valve 620, increase the opening of the first control valve 530, raise the fourth temperature to above the second predetermined temperature, and ensure that the temperature control bypass unit 600 operates normally.

[0043] In this embodiment, the controller is installed independently of the first control valve 530 and the second control valve 620, and can control the first control valve 530 and the second control valve 620 respectively. In some other embodiments, controllers are integrated into both the first control valve 530 and the second control valve 620, and the second control valve 620 can be operated independently of the first control valve 530 at night.

[0044] In the embodiments of the present application, the first working material is a dry working material, a wet working material, or an isentropic working material.

[0045] For example, a dry working material is selected as the first working material, as dry working materials have a good heat recovery effect.

[0046] Specifically, dry working materials can be selected from R245fa, R600, R600a, etc., wet working materials can be selected from R134a, etc., and isentropic working materials can be selected from R11, R142b, etc.

[0047] Referring to Figure 1, an embodiment of the present invention further provides a photovoltaic and photothermal mixed power plant, comprising a photovoltaic power generation system 200, a photothermal power generation system 300, and a waste heat power generation system 100, wherein the waste heat power generation system 100 is any of the aforementioned waste heat power generation systems 100, and the amount of electricity generated by the photovoltaic power generation system 200, the photothermal power generation system 300, and the waste heat power generation system 100 is all transported to a power storage device 400.

[0048] Referring to Figures 1 and 2, the first heat exchanger 110 of the waste heat power generation system 100 is used to acquire waste solar heat generated by the photovoltaic power generation system 200 and perform primary heat exchange with the first work material, and the second heat exchanger 120 of the waste heat power generation system 100 is used to acquire waste photothermal heat generated by the photothermal power generation system 300 and perform secondary heat exchange with the first work material.

[0049] Specifically, in the solar and photothermal mixed power plant of this embodiment, all of the technical solutions of any of the above-mentioned waste heat power generation systems 100 are adopted, and therefore all of the beneficial effects brought about by at least the technical solutions of the above embodiment are obtained, and will not be described one by one here.

[0050] In some embodiments, referring to Figures 1 and 2, the photothermal power generation system 300 includes a heat collection module (not shown) used to convert solar energy into thermal energy, a steam generation module 310 used to acquire the thermal energy converted by the heat collection module and perform heat exchange with a third working material, a second turbine 320 connected to the steam generation module 310 and used to perform work using the third working material after heat exchange to generate second mechanical work, and a second generator connected to the second turbine 320 and used to acquire second mechanical work and generate electricity. The system includes 330, an air-cooled island 340, the air-cooled island 340, the air-cooled island 340 being connected to the second turbine 320 and the air-cooled island 340, the second heat exchanger 120 being used to acquire the heat of a third working material used by the second turbine 320 and to perform secondary heat exchange with the first working material, and the air-cooled island 340 being used to cool the third working material after heat exchange, and a third pump 350 being connected to the air-cooled island 340 and the steam generation module 310 and used to transport the cooled third working material to the steam generation module 310 and enter into a heat exchange circulation.

[0051] In the photothermal power generation system 300, sunlight is concentrated on a single heat transfer medium (usually molten salt) via a reflector or lens, the molten salt can exchange heat with a third working material, and the second turbine 320 can generate electricity using the third working material after heat exchange.

[0052] Furthermore, the third working substance can be selected as water; it is liquid water when it is in a liquid state, and water vapor when it is in a gaseous state.

[0053] In some other embodiments, the water-powered circulation method of the steam generation module 310 is either natural circulation or forced circulation.

[0054] In this embodiment, the steam generation module 310 typically includes a second preheater, evaporator, drum, and superheater, and the liquid third working material is sequentially heated to a gaseous third working material via the second preheater, evaporator, drum, and superheater. If the liquid third working material overcomes resistance by relying solely on its density as power, it is a natural circulation process; if the liquid third working material overcomes resistance by relying on a circulation pump to provide power, it is a forced circulation process. The natural circulation process has a large circulation ratio and good self-compensation capability; that is, when the heat absorption of the circuit increases, the amount of circulating water increases accordingly, but a drum with a large volume is required to reduce flow resistance. The forced circulation process can provide sufficient pressure and capacity even in operating conditions such as starting and stopping, and has a greater time advantage, but increases system maintenance costs.

[0055] Referring to Figure 3, the embodiment of the present application further provides a waste heat power generation method which can be applied to any of the above waste heat power generation systems 100. Step S100 involves acquiring the solar waste heat generated by the solar power generation system and performing primary heat exchange with the first working material, Step S200 involves acquiring the waste heat generated by the photothermal power generation system and performing secondary heat exchange with the first working material, Step S300 involves generating first mechanical work by performing work using the first working material after secondary heat exchange, Step S400 involves acquiring the first machine work and generating electricity, Step S500 involves cooling the first working material used, The process includes step S600, which involves transporting the cooled first working material to the first heat exchanger to enter the heat exchange circulation.

[0056] Furthermore, since the waste heat power generation method of this embodiment is applied to any of the above-mentioned waste heat power generation systems, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, and therefore will not be explained one by one here.

[0057] It should be understood that the embodiments of this application are not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from that scope. The scope of this application is limited only by the claims.

[0058] This application claims priority to the Chinese patent application filed with the China National Intellectual Property Office on January 31, 2024, application number 2024101389862, with application title "Waste Heat Power Generation System, Photovoltaic and Photothermal Mixed Power Plant and Waste Heat Power Generation Method," the entire contents of which are incorporated into this application by reference. [Explanation of Symbols]

[0059] 100 waste heat power generation systems, 110 first heat exchanger, 120 second heat exchanger, 130 First turbine, 140 First generator, 150 condenser, 160 First pump, 170 Solar heat recovery units, 171 First piping, 172 Second piping, 173 Second pump, 180 First preheater, 200 solar power generation systems, 300 photovoltaic power generation systems, 310 steam generation module, 320 Second turbine, 330 Second generator, 340 Air-cooled Island 350 Third pump, 400 energy storage devices, 500 Heat Storage Bypass Unit, 510 1st main road, 520 First temperature sensor, 530 First control valve, 540 First junction, 550 Heat storage, 560 Second temperature sensor, 600 Temperature Control Bypass Unit, 610 Third temperature sensor, 620 Second control valve, 630 Second fork in the road, 640 heat pumps, 650 Fourth temperature sensor.

Claims

1. A first heat exchanger for acquiring waste solar heat generated by a solar power generation system and performing primary heat exchange with a first working material, A second heat exchanger is connected to the first heat exchanger and acquires the waste heat generated by the photothermal power generation system to perform secondary heat exchange with the first working material, A first turbine connected to the second heat exchanger, which performs work using the first working material after secondary heat exchange to generate first mechanical work, A first generator connected to the first turbine for obtaining the first mechanical work and generating electricity, A condenser connected to the first turbine for cooling the first working material used by the first turbine, The system includes a first pump connected to the condenser and the first heat exchanger, for transporting the cooled first working material to the first heat exchanger and entering the heat exchange circulation, A waste heat power generation system characterized by the following:

2. The system further includes a solar waste heat recovery unit, the solar waste heat recovery unit including a solar waste heat acquisition module and a second pump. The solar waste heat acquisition module includes a first pipe, which is used to connect the solar power generation system, and has a second working material inside the first pipe, which is used to acquire the solar waste heat generated by the solar power generation system. The second pump is connected to the first piping and is used to transport the second working material, after acquiring the solar waste heat, to the first heat exchanger and to perform primary heat exchange with the first working material. The waste heat power generation system according to claim 1, wherein the solar waste heat acquisition module further includes a second pipe, the second pipe being used to connect the solar power generation system and the first heat exchanger, and the second working material after heat exchange is transmitted to the solar power generation system to enter the heat exchange circulation.

3. The waste heat power generation system according to claim 2, characterized in that the aforementioned solar waste heat acquisition module is a solar energy frequency division and utilization module or a fixed solar energy frequency division and utilization module.

4. The waste heat power generation system according to claim 1, further comprising a first preheater, the first preheater being installed between the first turbine and the first condenser, and the first preheater being further installed between the first pump and the first heat exchanger, and the first preheater being used to preheat the first working material away from the first pump.

5. The heat storage bypass unit further includes, A first main path is used to connect the second heat exchanger and the first turbine so that the first working material flows from the second heat exchanger to the first turbine, A first temperature sensor installed in the first main path and used to detect the first temperature of the first working material at the outlet of the second heat exchanger, A first control valve is installed in the first main path and is located between the first temperature sensor and the first turbine, A first branch passage is provided, one end of which is connected to the first control valve and the other end of which is connected to the first main passage between the first control valve and the first turbine, and is arranged so that the first working material flows from the first control valve to the first main passage. A heat storage device installed in the first branching path and used to obtain the heat energy of the first work material, A second temperature sensor is installed between the other end of the first branch and the first turbine and is used to detect the second temperature of the first working material. A waste heat power generation system according to any one of claims 1 to 4, comprising: a controller which is communicated to the first temperature sensor, the first control valve, the heat accumulator, and the second temperature sensor, and which controls the first control valve to turn on when the first temperature is higher than a first predetermined temperature, causing the heat accumulator to acquire the heat quantity of a portion of the first working material, mixing the first working material from which the heat quantity has been acquired with the first working material from which the heat quantity has not been acquired, thereby lowering the temperature of the first working material, and further controls the opening of the first control valve to increase when the second temperature is higher than a first predetermined temperature, thereby causing the second temperature to fall below the first predetermined temperature.

6. The system further includes a temperature control bypass unit, the temperature control bypass unit is A third temperature sensor installed in the first branching path and used to detect the third temperature of the first working material at the outlet of the heat storage device, A second control valve is installed in the first branch line and is located between the third temperature sensor and the first turbine, A second branch passage is provided, one end of which is connected to the second control valve and the other end of which is connected to the first branch passage between the second control valve and the first turbine, and is arranged so that the first working material flows from the second control valve to the first branch passage. A heat pump installed in the second branch line and used to increase the heat content of the first work material, The system includes a fourth temperature sensor installed in the first branch between the other end of the second branch and the first turbine, which is used to detect the fourth temperature of the first working material, The controller is communicated to the third temperature sensor, the second control valve, the heat pump, and the fourth temperature sensor, respectively, and the controller controls the first control valve to turn on when the third temperature is lower than the second predetermined temperature, guiding all of the first working material to the first branch path, and controls the second control valve to turn on, causing the heat pump to increase the heat quantity of at least some of the first working material, mixing the first working material with the heat quantity that has been increased and the first working material with which the heat quantity has not been increased, thereby increasing the temperature of the first working material, and the controller is further used to increase the opening of the second control valve when the fourth temperature is lower than the second predetermined temperature, thereby causing the fourth temperature to be equal to or higher than the second predetermined temperature, as described in claim 5.

7. The waste heat power generation system according to any one of claims 1 to 4, characterized in that the first working material is a dry working material, a wet working material, or an isentropic working material.

8. The aforementioned photovoltaic power generation system and photothermal power generation system, A waste heat power generation system which is a waste heat power generation system according to any one of claims 1 to 4, The first heat exchanger of the waste heat power generation system is used to acquire the waste solar heat generated by the photovoltaic power generation system and to perform primary heat exchange with the first working material. The second heat exchanger of the waste heat power generation system is used to acquire the waste heat generated by the photothermal power generation system and perform secondary heat exchange with the first working material. A solar and photothermal power plant characterized by the following features.

9. The photovoltaic power generation system includes a heat collection module, a steam generation module, a second turbine, a second generator, an air-cooled island, and a third pump. The aforementioned heat collection module is used to convert solar energy into thermal energy. The steam generation module is used to acquire the thermal energy converted by the heat collection module and to perform heat exchange with the third working material. The second turbine is connected to the steam generation module and is used to perform work using the third working material after heat exchange to generate second mechanical work. The second generator is connected to the second turbine, and the second generator is used to acquire the second mechanical work and generate electricity. The second heat exchanger is connected to the second turbine and the air-cooled island, and is used to acquire the heat of the third working material used by the second turbine and perform secondary heat exchange with the first working material, and the air-cooled island is used to cool the third working material after heat exchange, The photovoltaic and photothermal power plant according to claim 8, characterized in that the third pump is connected to the air-cooled island and the steam generation module, and the third pump is used to transport the cooled third working material to the steam generation module for heat exchange circulation.

10. The solar and photothermal power plant according to claim 9, characterized in that the water-powered circulation method of the steam generation module is natural circulation or forced circulation.

11. A method for generating electricity using waste heat, which is applied to the waste heat power generation system described in any one of claims 1 to 4, The steps include: acquiring the solar waste heat generated by the solar power generation system and performing primary heat exchange with the first working material; The steps include acquiring the thermal waste generated by the photothermal power generation system and performing secondary heat exchange with the first working material, A step of generating the first mechanical work by performing work using the first working material after secondary heat exchange, The first step of acquiring mechanical work and generating electricity, A step of cooling the first working material used, A method for generating power from waste heat, characterized by comprising the step of transporting the first working material after cooling to a first heat exchanger and entering a heat exchange circulation.

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